Initial commit

Homework/Homework250313/Query.sql

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+USE Homework250313
+Go
+-- 求供应工程 J1 零件的供应商号 SNO
+SELECT DISTINCT SNO
+FROM SPJ
+WHERE JNO = 'J1';
+Go
+-- 求供应工程 J1 零件 P1 的供应商号 SNO
+SELECT DISTINCT SNO
+FROM SPJ
+WHERE JNO = 'J1'
+  AND PNO = 'P1';
+Go
+-- 求供应工程 J1 红色零件的供应商号 SNO
+SELECT DISTINCT SPJ.SNO
+FROM SPJ
+         JOIN P ON SPJ.PNO = P.PNO
+WHERE SPJ.JNO = 'J1'
+  AND P.COLOR = N'红';
+Go
+-- 求没有使用天津供应商生产的红色零件的工程号 JNO
+SELECT JNO
+FROM J
+WHERE JNO NOT IN (SELECT DISTINCT SPJ.JNO
+                  FROM SPJ
+                           JOIN S ON SPJ.SNO = S.SNO
+                           JOIN P ON SPJ.PNO = P.PNO
+                  WHERE S.CITY = N'天津'
+                    AND P.COLOR = N'红');
+Go
+-- 求至少用了 S1 供应商所供应的全部零件的工程号 JNO
+SELECT JNO
+FROM SPJ
+WHERE PNO IN (SELECT PNO FROM SPJ WHERE SNO = 'S1')
+GROUP BY JNO
+HAVING COUNT(DISTINCT PNO) = (SELECT COUNT(DISTINCT PNO) FROM SPJ WHERE SNO = 'S1');
+Go
+-- 找出所有供应商的姓名和所在城市
+SELECT SNAME, CITY
+FROM S;
+Go
+-- 找出所有零件的名称、颜色、重量
+SELECT PNAME, COLOR, WEIGHT
+FROM P;
+Go
+-- 找出使用供应商 S1 所供应零件的工程号码
+SELECT DISTINCT JNO
+FROM SPJ
+WHERE SNO = 'S1';
+Go